Yahoo 421 Message from (IP) temporarily deferred

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Posted by Maxihost, 07-15-2008, 12:38 PM
Hello, I am opening this thread to complain about Yahoo mail issues with our ISP. Its been a month that we are having problems trying to send e-mail to Yahoo accounts. First of all we are a Web Hosting company in Brazil and the IP that they blocked only host our main domain maxihost.com.br. We dont send bulk ou spam e-mails, we only send invoices and support replies to their accounts. The logs from our mail servers when trying to e-mail them is below, Note that I already filled out the form http://help.yahoo.com/l/us/yahoo/mai...ter/defer.html telling them I am an ISP and I do not send any e-mail spam for their accounts, although every time I fill it I get an automatic/canned e-mail from their system with the following content, When I try to reply to that e-mail I get an error back. Please, any help is very appreciated.
Posted by NicAddress, 07-15-2008, 12:43 PM
Enable domain keys and make sure you have a RDNS entry for that server.
Posted by Maxihost, 07-15-2008, 12:48 PM
Hello, Thank you for your reply PTRs are already correctly set up as you can see below, Again, that IP only host our main domain maxihost.com.br and no SPAM are sent from that IP.
Posted by John[H4Y], 07-15-2008, 03:59 PM
Our dedicated and colo clients sometimes get these deferrments and it usually seems to be for no rythme or reason. At times, it even seems as though particular Yahoo mail servers accept mail while others don't. Almost as if some get overloaded and start deferring connections. In any case, the mail does seem to get through eventually, but there are some "bad hair days" for Yahoo mail sometimes.

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